Spark-plug



J'. BLOMSTER AND J. SCHABEN.

SPARK PLUG.

APPLICATION FILED IuNEzs. ISIS..

Patentd Oct. 5, 1920my UNITED STATES PATENT OFFICE.

JOEL BLOMSTER AND JOSEPH SCHABEN, OF ALGUNA, IOWA. ASSIGNORS TO JOSEPH SCHABEN, OF ALGONA, IOWA.

SPARK-PLUG.

Application filed June 23.

To all who-m t may concern:

Be it known that we, JOEL BLoMsTEn and JosErH SoHAisnN, citizens of the United States. residing at Algona, in the county of Kossuth and State of Iowa, have invented certain new and useful Improvements in Spark-Plugs; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the artto which it appertains to make and use the same.

The present "invention'i'elates to spark plugs, and has for its ob]ect the provision of novel and `improved cooperating electrodes to provide an effective spark undei all conditions, and so arranged and formed that carbon deposits will be blown or cleaned from theelectrodes. n

A further object is the provision of a spark plug so formed as to reduce to a minimum the liability for oil woiking upwardly into the plug and fouling saine. I

With the foregoing and other ob]ects in View, which will be apparent as the d escription proceeds, the invention resides in the construction and arrangement of parts hereinafter described and claimed, it being understood that changes can be made within the scope ofwhat is claimed without departing from the spirit of the invention.

The invention is illustrated in the accompanyng drawing, wherein Figure 1 is a side elevation of the spark plug embodying the improvements, portions being broken away as shown in section.

Fig. 2 is an inner end view of the plug.

Fig. 3 is a side elevation of the inner end portion of the plug looking at right angles to the line of view in Fig. 1.

Fig. 4 is a view, partly in elevation and partly in longitudinal section, showing a modification.

The. plug embodies according to the usual practice a tubular shell or body 1 of metal, and an insulator 2 secured within said shell, and provided at its outerlend with akbinding post 3 for the connection of the wire or electrical conductor.

In carrying out the invention, the inner electrode 4L., comprising a rod of metal, eX- tends from the inner end of the insulator 2 through the inner end of the shell 1 beyond same, and the end of the electrode is preferably tapered as at 5, and is provided with Specification of Letters Patent.

atcnted Oct. 5, 1920.

1919. Serial No. 306.252.

oil working up within the shell, and this will lessen the possibility of the plug becoming fouled with oil. This thickening of the end of thc plug or contraction of the opening is limited to thc end of the shell and the opening or bore of the plug is larger in diameter above the inner end of the shell, as seen in Fig. l.

The outer electrode S is of arcuate cross section or concaved longitudinally, and eX- tends obliquely from` the inner end of the shell l at one side thereof to the end of the electiode 4, so that said electrodes converge toward one another with their active ends close together to provide the spark gap. rl`he basal end of the electrode S has a shank 9 to be secured within a hole or aperture l0 formed in the thickened end of the shell, thereby making the electrical connection between the electrode S and shell 1. The electrode S being of curved or concaved cross section extends partially around the end of the electrodes 4, as seen in Fig. thus pioviding an arcuate spark gap across which the sparks can jump at various points, to' assure ot' an effective spark under all conditions. I `urthermore, by the arrangement of the electrode 8, it extends partially across the open end of the shell, and converges toward the electrode el, so that when the explosion occurs, the burning gases in being expelled from the chamber of the shell will be caught by the electrode S and carried through the spark gap between the two electrodes so as to blow out the carbon deposits therefrom. The electrodes 8 as well as the end of the electrode 4 are thin so as be heated for drying and crumbling the carbon, and the electi'ode 8 being of scoop shape will catch the expanding gases which pass fiom within the shell, and thus direct such gases to the restricted spark gap for effectively blowing thecarbon from the adjacent sides of the electrodes.

The expanding gases in passing from the shell are caught within the electrode 8, and

said electrode being of scoop or channelshape will retain the gases therein directed away from the shell and will conduct such gases with considerable force through the spark gap. The space between the electrode 4 and shell l opposite to the electrode 8 is not encumbered so that there is free circulation into and out of the shell, and the electrode 8 being arranged to catch a suflicient amount of the gas flowing from the shell to create the concentrated flow of gas through the spark gap for keeping the electrodes clean.

In Fig. 4, a modification is shown, wherein the electrode 8 has a shank 9 integral with the end of a sleeve 1l fitted within the shell and provided with a flange l2 at its opposite end clamped against thel shoulder 15 within the shell upon lwhich insulatoibQ is clamped. This sleeve 1l" can be readily inserted into the shell before the insulator 2 is inserted, and is therefore held in place by the same means which secures the insulator within the shell, instead of securing the outer electrode to the inner end of the shell by independent means as shown in Fig. l.

Having thus described the invention, what is claimed as new is 1. A spark plug embodyinga shellhaving a shoulder therein,` an insulator secured within said shell, a sleeve fitted in said shell and having a flange at its outer end clamped between said shoulder and insulator, an inner electrode extending through said insulator and beyond the inner end of the shell, and an outer electrode extending from the other end of said sleeve obliquely toward the inner eleetrode and converging to the end thereof. said outer electrode being coneaved transversely and extending partially around said end of the inner electrode.

2. A spark plug embodying a shell, an inner electrode extending from within the shell beyond the inner end thereof, the end of the said electrode being hollow, and an outer electrode extending obliquely from the inner end of the shell at one side and converging to the end of the inner electrode, said outer electrode heilig concaved transversely and extending partially around said hollow end of the inner electrode. i

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

JOEL BLOMSTER JOSEPH SCHABEN.

Witnesses:

J. MoEvoY, H. E. RIsT. 

